A. The auxiliary winding in a single phase motor is usually for? a. extra power

Question

A. The auxiliary winding in a single phase motor is usually for? a. extra power b. starting the motor c extra torque d extra speed B. The capacitor used in a single phase motor is for a working as a filter. b. providing reactive power. c. improving power factor d. getting a phase angle between the currents in the two motor winding C. If the centrifugal switch in a single phase motor is open when the motor is connected to a power source, the motor's a. main winding current is 0 b, starting torque is 0. c. all currents are 0. d. magnetic field is 0. D. When the power supply frequency is the same, a 4 pole single phase motor speed is a. twice of the speed of a 2 pole single phase motor. b. half of the speed of a 2 pole single phase motor. c. the same speed of a 2 pole single phase motor d. not comparable to the speed of a 2 pole single phase motor. E. List two types of single-phase motors.

Explanation / Answer

A.option b

Reason:To make single phase induction motor self starting ,we should some how produce a revolving stator magnetic field this this may be achieved by converting single phase supply to two phase supply through the use of additional winding which is known as auxiliary winding

B. Option d

Reason: the phase angle between the two currents is about 80degrees when we place a capacitor .the current in the starting winding is only about half that is in split phase induction motor .therefore starting winding heats up less quickly

C.option b

Reason: Because the centrifugal switch will open when motor reaches 75% of synchronos speed

D.option b

Formula speedN=(120f/p)

F is frequency P is no of poles

E.the two types of single phase induction motor are shaded pole and split phase

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